HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1)
Subclass of:
548 - Organic compounds -- part of the class 532-570 series
548000000 - ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1)
Patent class list (only not empty are listed)
Deeper subclasses:
Class / Patent application number | Description | Number of patent applications / Date published |
---|---|---|
548100000 | Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) | 1310 |
548400000 | Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) | 842 |
548950000 | The hetero ring contains four members including nitrogen and carbon | 15 |
548954000 | Hetero ring is three-membered including nitrogen and carbon | 9 |